| 학회 |
한국재료학회 |
| 학술대회 |
2009년 봄 (05/21 ~ 05/22, 무주리조트) |
| 권호 |
15권 1호 |
| 발표분야 |
전자재료 |
| 제목 |
Modified co-precipitation synthesis of spherical shape Ce doped YAG |
| 초록 |
Yttrium aluminum garnet (YAG), Y3Al5O12, materials are well known, with high stability at the conditions of high irradiance with an electron beam. Trivalent cerium-activated YAG (YAG:Ce3+) is suitable for converting the blue light emitting diodes (LEDs) radiation into a very broad band yellow emission, which provides a basis to use YAG:Ce phosphor along with GaN LEDs to produce white light emitting diodes (WLEDs). YAG (Y3Al5O12) powders with different percentage of trivalent cerium ion have been prepared by co-precipitation technique in which NH4OH is used as a precipitant and Y2O3, A1((NO3) 3•9H2O and Ce(NO3)3.6H2O as raw materials. The phase formation process of YAG and the properties of the powders were investigated by means of X-ray diffraction (XRD), Fourier transformation infrared spectroscopy (FT-IR) and Scanning electron microscopy (SEM). The results of XRD show that single phase YAG crystallite can be obtained as precursors when heated at 900oC for 2 h. The powders loosely dispersed with narrow size distribution and spherical shapes could be observed by SEM. It has been found that the hydrothermal treatment of precursor powder using water and ethanol as a solvent and citric acid as a surfactant is beneficial for the synthesis of spherical YAG powder. The optical property of Ce doped YAG was investigated by photoluminescence spectroscopy. The crystalline YAG:Ce showed broad emission peaks in the range 480–650 nm and had maximum intensity at 520 nm. The emission intensity decreased with increasing the cerium ion concentration. |
| 저자 |
Prabhakar Rai1, Yeon-Tae Yu2, Suraj Kumar Tripathy1, Nam-Hee Park2, Jin-Nyeong Jo3
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| 소속 |
1Division of Metrials Engineering, 2Chonbuk National Univ., 3Division of Metrials Engeneering |
| 키워드 |
Metal oxide; X-ray diffraction; electron microscopy; photoluminescence
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| E-Mail |
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